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John Dalton devised that matter consisted of indivisible atoms. He proposed that they cannot be subdivided, created or destroyed.
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Joseph John Thomson's model proposed that an atom has an overall neutral charge. In an atom, positive charges and negative charges are equal.
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Ernest Rutherford's model showed that atoms are mostly empty space. It's mass is concentrated in the centre. In an atom, electrons are found outside the nucleus.
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Niels Bohr stated that electrons orbit the nucleus and have varying orbits.
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Erwin Schrödinger proposed that electrons don't move in orbits but exist at different levels. The electron cloud is where the negative charge comes from.